Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: "Magnetic Variation" vs "Magnetic Declination"
    From: Frank Reed CT
    Date: 2007 Jan 8, 20:36 EST
    Lu Abel wrote:
    "I ran into an immediate shock:  while we of the mariner persuasion call
    the difference between true north and magnetic north "magnetic
    variation," most of the rest of the scientific community calls it
    "magnetic declination."
    For example, see http://en.wikipedia.org/wiki/Magnetic_declination
    Does anyone know why this disparity in terminology exists?"
     
    I don't know how we ended up with two terms (maybe geologists picked it up from continental usage?), but I do think it's important to be aware that the vast majority of people who know about "variation" call it "declination".
     
    I will say this though: the existence of these two terms is proof that two distinct user groups can invent equally BAD technical terminology! Neither of the terms is descriptive and both can easily be confused with other phenomena. Declination sounds more like an alternative name for magnetic dip. Variation sounds more like a term for the rate of change of the magnetic field direction. Oh well. We're stuck with 'em now.
     
    -FER
    42.0N 87.7W, or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars

    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site